﻿using System.Windows.Input;

namespace HdhWpf.AppCode
{
    public class RelayCommand : ICommand
    {
        private readonly Action<object> _execute;
        private readonly Func<object, bool> _canExecute;
        public RelayCommand(Action<object> execute, Func<object, bool> canExecute = null)
        {
            _execute = execute ?? throw new ArgumentNullException(nameof(execute));
            _canExecute = canExecute;
        }
        public RelayCommand(Action execute, Func<bool> canExecute = null): this(execute != null ? (o) => execute() : (Action<object>)null,canExecute != null ? (o) => canExecute() : (Func<object, bool>)null)
        {
        }

        public bool CanExecute(object parameter)
        {
            return _canExecute == null || _canExecute(parameter);
        }

        public void Execute(object parameter)
        {
            _execute(parameter);
        }

        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }
    }
}
